Get all embedded documents with “isMarried” status in a MongoDB collection

To get all embedded documents, use $project in MongoDB. Let us create a collection with documents −

> db.demo220.insertOne({ ...   "id":101, ...   "FullName" : "John Doe", ...   "EmailId" : "john12@gmail.com", ...   "ShippingDate" : new ISODate(), ...   "details" : { "_id" :1001, "isMarried" :true } ...} ...); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3eaf5b03d395bdc213471d") } > db.demo220.insertOne( ...{ ...   "id":102, ...   "FullName" : "John Smith", ...   "EmailId" : "johnsmith@gmail.com", ...   "ShippingDate" : new ISODate(), ...   "details" : { "_id" :1002, "isMarried" :false } ... } ... ); {    "acknowledged" : true,    "insertedId" : ObjectId("5e3eaf5c03d395bdc213471e") }

Display all documents from a collection with the help of find() method −

> db.demo220.find();

This will produce the following output −

{ "_id" : ObjectId("5e3eaf5b03d395bdc213471d"), "id" : 101, "FullName" : "John Doe", "EmailId" : "john12@gmail.com", "ShippingDate" : ISODate("2020-02-08T12:53:47.876Z"), "details" : { "_id" : 1001, "isMarried" : true } } { "_id" : ObjectId("5e3eaf5c03d395bdc213471e"), "id" : 102, "FullName" : "John Smith", "EmailId" : "johnsmith@gmail.com", "ShippingDate" : ISODate("2020-02-08T12:53:48.991Z"), "details" : { "_id" : 1002, "isMarried" : false } }

Following is the query to get all embedded documents −

> db.demo220.aggregate({ $project : { ...   "isMarried" : "$details.isMarried", ...   "detailsId" : "$details_id", } });

This will produce the following output −

{ "_id" : ObjectId("5e3eaf5b03d395bdc213471d"), "isMarried" : true } { "_id" : ObjectId("5e3eaf5c03d395bdc213471e"), "isMarried" : false }